:orphan:
# DMTSCheckResidual
Check the residual of the exact solution 
## Synopsis
```
#include "petscdmplex.h" 
#include "petscts.h" 
PetscErrorCode DMTSCheckResidual(TS ts, DM dm, PetscReal t, Vec u, Vec u_t, PetscReal tol, PetscReal *residual)
```

## Input Parameters

- ***ts  -*** the `TS` object
- ***dm  -*** the `DM`
- ***t   -*** the time
- ***u   -*** a `DM` vector
- ***u_t -*** a `DM` vector
- ***tol -*** A tolerance for the check, or -1 to print the results instead



## Output Parameter

- ***residual -*** The residual norm of the exact solution, or `NULL`





## See Also
 [](ch_ts), `DM`, `DMTSCheckFromOptions()`, `DMTSCheckJacobian()`, `DNSNESCheckFromOptions()`, `DMSNESCheckDiscretization()`, `DMSNESCheckJacobian()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/utils/dmplexts.c.html#DMTSCheckResidual">src/ts/utils/dmplexts.c</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/ts/utils/dmplexts.c)


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